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Coronal magnetic field measurement using loop oscillations observed by Hinode/EIS
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Van Doorsselaere, Tom, Nakariakov, V. M. (Valery M.), Young, P. R. (Peter R.) and Verwichte, E. (Erwin) (2008) Coronal magnetic field measurement using loop oscillations observed by Hinode/EIS. Astronomy & Astrophysics, Vol.487 (No.2). L17-L20. doi:10.1051/0004-6361:200810186 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361:200810186
Abstract
We report the first spectroscopic detection of a kink MHD oscillation of a solar coronal structure by the Extreme-Ultraviolet Imaging Spectrometer (EIS) on the Japanese Hinode satellite. The detected oscillation has an amplitude of 1 kms−1 in the Doppler shift of the FeXII 195 Å spectral line (1.3 MK), and a period of 296 s. The unique combination of EIS’s spectroscopic and imaging abilities
enables us to measure simultaneously the mass density and length of the oscillating loop. This enables us to measure directly the magnitude of the local magnetic field, the fundamental coronal plasma parameter, as 39 ± 8 G, with unprecedented accuracy. This proof of concept makes EIS an exclusive instrument for the full scale implementation of the MHD coronal seismological technique.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Sun -- Corona, Solar oscillations, Solar magnetic fields, Sun -- Loop prominences , Magnetohydrodynamics | ||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||
Publisher: | E D P Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | August 2008 | ||||
Dates: |
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Volume: | Vol.487 | ||||
Number: | No.2 | ||||
Page Range: | L17-L20 | ||||
DOI: | 10.1051/0004-6361:200810186 | ||||
Status: | Peer Reviewed | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC) |
Data sourced from Thomson Reuters' Web of Knowledge
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